单项选择题

Any earthquake that takes place in any area is certainly regarded as a kind of a ______ event.

A．cholesterol
B．charcoal
C．catastrophic
D．chronic
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单项选择题
The ______ of the spring water attracts a lot of visitors from other parts of the country.
A．clash
B．clarify
C．clarity
D．clatter
单项选择题
It all started in 1950, when people began to build their houses on the ______ of their cities.
A．paradises
B．omissions
C．orchards
D．outskirts
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